JPH0374613A - Rod-less cylinder - Google Patents

Abstract

PURPOSE:To increase the holding force by setting a yoke gap between a driving magnet train constituted of an inner magnet, an inner yoke and a piston and a driven magnet train constituted of an outer magnet, an outer yoke and a wearing holder within a specific range. CONSTITUTION:A driving magnet train 2 is inserted into a cylinder 1 slidably in the axial direction. As the driving magnet train 2 is slid in a cylinder tube 4 by the fluid pressure, the driven magnet train 3 follows via the magnetic force action. The above magnetic force is obtained by permanent magnets 8 and 17 and yokes 9 and 18 provided on the driving magnet train 2 and the driven magnet train 3. The gap size between the outer yoke 18 constituting the driven magnet train 3 and the inner yoke 9 constituting the driving magnet train 2 is set to about 0.5-1.5mm. The holding force can be increased.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to a rodless cylinder.

[Prior art J] Conventionally, this type of cylinder was manufactured using the
Publication No. 34 or Publication No. 58-76804
In order to increase the holding force of the rodless cylinder, this was done by arranging the magnets appropriately.

[Problem to be solved by the invention]

In order to increase the holding force, it is necessary to increase the magnetic force or size of the magnets, or increase the number of magnets, which makes the entire device more expensive and larger, and the rodless cylinder has to be made smaller. It would be contrary to the purpose.

The present invention is proposed to solve such problems.

[Means for Solving the Problem 1] The rodless cylinder of the present invention has two external magnets as a drive magnet array consisting of an internal magnet, an internal yoke, and a piston slides inside a cylinder tube by pressure fluid pressure. , in a cylinder in which a driven magnet array consisting of an external yoke and a wear ring holder follows and slides outside the cylinder tube by magnetic force.

It is characterized in that the yoke gap between the driving magnet array and the driven magnet array is approximately 0.5 mm to 1.5 mm.

[Example 1] The configuration of the present invention that achieves the above object will be explained based on an example.

In FIG. 1, 1 is a cylinder, 2 is a drive magnet array that is slidably fitted in the axial direction, and 3 is a drive magnet array 2 that slides inside a cylinder tube 4 by pressure fluid pressure. Accordingly, the driven 6f follows due to magnetic force! It is a row of stones. The above magnetic force is applied to the permanent magnets 8.17 and yokes 9.17 provided in both the driving fi1 stone row 2 and the driven magnet row 3.
18. Here, an external yoke 18 that constitutes the driven magnet array, and an internal yoke 9 that constitutes the drive magnet array.
By making the gap, ie, the dimension G in FIG. 2, smaller than before, the holding force can be increased.

For example, in the conventional φ250 diameter straight shilling, the dimension G in FIG. 2 is 2 mm, but in the present invention, the dimension G is 1.5 mm and 1.5 mm as shown in Table 1. By making it as small as Omm, the holding force increased by 13% and 20%, respectively. &n Energy is 2f of distance! It is clear from magnetic engineering that this is inversely proportional to , and it is clear that if the 6th dimension is made as small as possible in terms of manufacturing, the holding force will increase.

Table 1 [Effects of the Invention J As is clear from what has been stated above, 5 According to the present invention,
By devising the shape of the parts without increasing the magnetic force or the number of magnets.

Holding force can be increased.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of the invention. FIG. 2 is a partial cross-sectional view showing the yoke spacing between the driving magnet array and the driven magnet array. l 7 ・ l 8 ・ ・Cylinder, driving magnet row, driven m6 rows, cylinder tube, magnet, yoke or more

Claims (1)

[Claims] As a driving magnet array consisting of an internal magnet, an internal yoke, and a piston slides inside a cylinder tube by pressure fluid pressure, a driven magnet array consisting of an external magnet, an external yoke, and a wear ring holder In a cylinder in which a magnet array follows and slides outside the cylinder tube by magnetic force, the yoke gap between the driving magnet array and the driven magnet array is approximately 0.5 mm to 1.5 mm. rodless cylinder.